Hi,

On Tue, Dec 7, 2021 at 1:33 PM Rob Clark robdclark@gmail.com wrote:

From: Rob Clark robdclark@chromium.org

Otherwise we don't get another shot at it if the bridge probes before the dsi host is registered. It seems like this is what *most* (but not all) of the other bridges do.

It looks like this was missed in the conversion to attach dsi host at probe time.

Fixes: c3b75d4734cb ("drm/bridge: sn65dsi86: Register and attach our DSI device at probe") Signed-off-by: Rob Clark robdclark@chromium.org

---

v2: Drop DRM_ERROR() in favor of drm_err_probe() and shift around the spot where we report the error

drivers/gpu/drm/bridge/ti-sn65dsi86.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index 02b490671f8f..8f1321ca819e 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -714,10 +714,8 @@ static int ti_sn_attach_host(struct ti_sn65dsi86 *pdata) };

    host = of_find_mipi_dsi_host_by_node(pdata->host_node);

•   if (!host) {
  

•           DRM_ERROR("failed to find dsi host\n");
  

•           return -ENODEV;
  

•   }
  

•   if (!host)
  

•           return -EPROBE_DEFER;
  
    dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
    if (IS_ERR(dsi)) {
  

@@ -1267,8 +1265,10 @@ static int ti_sn_bridge_probe(struct auxiliary_device *adev, drm_bridge_add(&pdata->bridge);

    ret = ti_sn_attach_host(pdata);

•   if (ret)
  

•   if (ret) {
  

•           dev_err_probe(pdata->dev, ret, "failed to attach dsi host");
  

nit: Needs a "\n" at the end, doesn't it?

            goto err_remove_bridge;

•   }
  

It's going to be a little funny now because if the devm_mipi_dsi_attach() call fails you'll report "failed to attach dsi host" twice (once using DRM_ERROR in ti_sn_attach_host() and once here). Probably all the error messages could be removed from ti_sn_attach_host() and you could rely on this new one because: * devm_mipi_dsi_device_register_full() already appears plenty chatty. * this is the same message that devm_mipi_dsi_attach() was printing out anyway.

In any case, it's not really a big deal, so with the "\n" added I'm happy with my Reviewed-by.

I'm happy to apply this to to drm-misc-next tomorrow if there are no objections. I can always add the "\n" myself unless you want to send a v3 with it and/or want to remove more error messages. ;-)

-Doug